Electrochemical process for producing a catalyst

Production of a catalyst comprises electrochemically depositing a catalytic active material (6) on a substrate (4) whilst the substrate is immersed in an electrolyte (5) containing the catalytically active material; and applying an electrical voltage between the substrate and a counter electrode (3). Platinum is deposited on the substrate from a platinum-containing sulfuric acid solution or a platinum/ruthenium mixture is deposited on a metallic substrate from a sulfuric acid solution with platinum and ruthenium as catalytically active material. Preferred Features: The electrolyte is aged under the action of electromagnetic radiation and/or under the action of air or oxygen before depositing the catalytically active material. The electrolyte remains still while aging. The substrate is made of a steel selected from chromium steel 1.4541, 1.4571 and/or 1.4767. An electrical direct voltage of 1-1.4 V is applied between the substrate and the counter electrode. The counter electrode is made from platinized titanium.